title: Effects of a three-year exposure to ambient ozone on biomass allocation in poplar using ethylenediurea.
abstract: We examined the effect of ambient ozone on visible foliar injury, growth and biomass in field-grown poplar cuttings of an Oxford clone sensitive to ozone (Populus maximoviczii Henry × berolinensis Dippel) irrigated with ethylenediurea (EDU) or water for three years. EDU is used as an ozone protectant for plants. Protective effects of EDU on ozone visible injury were found. As a result, poplar trees grown under EDU treatment increased leaves, lateral branches and root density in the third year, although no significant enhancement of stem height and diameter was found. Ambient ozone (AOT40, 24.6 ppm h; diurnal hourly average, 40.3 ppb) may finally reduce carbon gain by reducing the number of branches, and thus sites for leaf formation, in ozone-sensitive poplar trees under not-limiting conditions.
authors.affiliation: Silviculture and Forest Ecological Studies, Hokkaido University, Sapporo 060-8689, Japan.
authors.forename: Yasutomo
authors.initials: Y
authors.lastname: Hoshika
authors.forename: Francesco
authors.initials: F
authors.lastname: Pecori
authors.forename: Ilaria
authors.initials: I
authors.lastname: Conese
authors.forename: Tommaso
authors.initials: T
authors.lastname: Bardelli
authors.forename: Enrico
authors.initials: E
authors.lastname: Marchi
authors.forename: William J
authors.initials: WJ
authors.lastname: Manning
authors.forename: Ovidiu
authors.initials: O
authors.lastname: Badea
authors.forename: Elena
authors.initials: E
authors.lastname: Paoletti
mesh_terms: D057914:Agricultural Irrigation; D000393:Air Pollutants / Q000633:toxicity*; D010126:Ozone / Q000633:toxicity*; D010671:Phenylurea Compounds / Q000494:pharmacology*; D032107:Populus / Q000187:drug effects / Q000502:physiology*; D020011:Protective Agents / Q000494:pharmacology*
chemical_list: D000393:Air Pollutants; D010671:Phenylurea Compounds; D020011:Protective Agents; C032766:ethylene diurea; D010126:Ozone
keywords: Biomass; Carbon allocation; EDU; Ethylenediurea; Ground-level O(3); Populus